First - flushing the radiator. First hose is easy to get to. I have yet to find the second one - it's buried under a mess of tubing and parts. This Alfa has a/c (currently inoperative), power steering and power brakes and a complicated Bosch fuel injection system with all kinds of sensors and relays. The TR6 looks like a Model A in comparison. Changing the thermostat also requires removing some hoses and parts in order to get at the two bolts holding the t'stat housing. Plus I have to get a new gasket even if the t'stat is ok. A lot of mechanical and electrical stuff in a small space. Check your new car for a comparison.
Second - Driving experience. TR6 is more conventional old school LBC. Noisier, rougher riding, more skittish handling on rough roads, shorter-throw gearbox with no grinding, drum brakes at the rear, harder to steer at low speed but more torque and less shifting needed. (I don't have o/d). Top harder to put up and drivers side window extremely hard to crank up even though new parts installed some time ago. The triumph clutch catches at the bottom and the Alfa near the top. Both use a hydraulic clutch. The TR6 has a radiator cap, the Alfa doesn't. You fill the radiator from a plastic reservoir that sits on the firewall. It's self-bleeding. If you do your own work, you'd be better off with the TR6 and its simple mechanicals. The Alfa is a sophisticated, highly-tuned machine needing specialized knowledge and tools to maintain properly. if you neglect it - it'll cost you.The TR6 is at its best on a smooth road with gentle sweeping bends at about 50-55 mph.
Alfa - this one is a 1992 - a far different Spider than the early models like Dustin Hoffman drove in the Graduate. It's a more comfortable tourer with power windows (with 4 buttons), power steering, power 4-wheel disc brakes. DOHC 2-liter engine developing 120 hp with Bosch f.i., two cooling fans! and a top that goes up with one hand (although it gets harder to put up and latch if you leave it down too long). The Alfa loves to rev - and rev - and needs it. It just keeps accelerating and going faster and faster as the engine starts to snarl. The TR takes off faster but runs out of revs and you have to shift. The Spider also has 5 speeds and a long gearshift sprouting out from under the dash board. Quirky but you get used to it. The steering wheel is also further away unlike most LBCs that put the steering wheel right up against your chest. Don't forget - this car is 21 years newer than the TR6. Who knows how the Triumph might have evolved had they continued to make it, so the comparison is not quite fair. The Alfa also cost more than the Triumph when new and more to fix. My son spent about $1,700.00 in Miami for new brakes, work on the fuel-injection sensors, new rear sway bar, and replacing that big rubber air inlet that goes across the engine. Parts were about $600.00 - the rest was labor. He also had new seats put in for $600.00.